Cách sử dụng
The word "necessity" is used to talk about something that is very important and absolutely needed. For example, food and water are a necessity for survival. It can also refer to things or actions that are required or mandatory. So, you could say that it's a necessity for students to do their homework in order to learn and do well in school. When using the word necessity, you are emphasizing the importance of the thing or action being discussed.